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General
Easy
Question
Find the magnetic induction of the field at the point O of a loop with current I, whose shape is illustrated in fig. the radius a and the side b are known
The correct answer is:
Related Questions to study
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Find the magnetic field at P due to the arrangement shown
Find the magnetic field at P due to the arrangement shown
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If the magnitude of the resultant magnetic field inductions at the points A, B and C due to the infinitely long parallel conductors carrying currents 
in the direction shown are B. B and B respectively then, the ascending order of magnetic fields induction are
If the magnitude of the resultant magnetic field inductions at the points A, B and C due to the infinitely long parallel conductors carrying currents in the direction shown are B. B and B respectively then, the ascending order of magnetic fields induction are
Physics-General
Physics-
Consider two different ammeters in which the deflections of the needle are proportional to current. The first ammeter is connected to a resistor of resistance 
and the second to a resistor of unknown resistance 
. At first the ammeters are connected in series between points A and B [as shown in fig. a)]. In this case the readings of the ammeters are 
and 
Then the ammeters are connected parallel between A and B as shown in fig.(B) and indicated 
and 
Determine the unknown resistance of the second resistor.
Consider two different ammeters in which the deflections of the needle are proportional to current. The first ammeter is connected to a resistor of resistance and the second to a resistor of unknown resistance . At first the ammeters are connected in series between points A and B [as shown in fig. a)]. In this case the readings of the ammeters are and Then the ammeters are connected parallel between A and B as shown in fig.(B) and indicated and Determine the unknown resistance of the second resistor.
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Physics-
A voltmeter of resistance and an ammeter of resistance 
are conected in series across a battery of negligible internal resistance. When a resistance R is connected in parallel to voltmeter, reading of ammeter increases three times while that of voltmeter reduces to one third. Find and in terms of R.
A voltmeter of resistance and an ammeter of resistance are conected in series across a battery of negligible internal resistance. When a resistance R is connected in parallel to voltmeter, reading of ammeter increases three times while that of voltmeter reduces to one third. Find and in terms of R.
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Physics-
A galvanometer of resistance 
,shunted by a resistance of 5 ohm gives a deflection of 50 divisions when joined in series with a resistance of 
and a 2 volt accumulator. What is the current sensitivity of the galvanometer (in div/
(A) ?
A galvanometer of resistance ,shunted by a resistance of 5 ohm gives a deflection of 50 divisions when joined in series with a resistance of and a 2 volt accumulator. What is the current sensitivity of the galvanometer (in div/(A) ?
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Physics-
A galvanometer has a current sensitivity of 1mA per division. A variable shunt is connected across the galvanometer and the combination is put in series with a resistance of 
and cell of internal resistance 
. It gives a deflection of 5 division for shunt of 5 ohm and 20 division for shunt of 25 ohm. Find the emf of cell and resistance of galvanometer.
A galvanometer has a current sensitivity of 1mA per division. A variable shunt is connected across the galvanometer and the combination is put in series with a resistance of and cell of internal resistance . It gives a deflection of 5 division for shunt of 5 ohm and 20 division for shunt of 25 ohm. Find the emf of cell and resistance of galvanometer.
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Physics-
A thin non conducting disc of radius R is rotating clockwise (see figure) with an angular velocity w about its central axis, which is perpendicular to its plane. Both its surfaces carry +ve charges of uniform surface density. Half the disc is in a region of a uniform, unidirectional magnetic field B parallel to the plane of the disc, as shown. Then,
A thin non conducting disc of radius R is rotating clockwise (see figure) with an angular velocity w about its central axis, which is perpendicular to its plane. Both its surfaces carry +ve charges of uniform surface density. Half the disc is in a region of a uniform, unidirectional magnetic field B parallel to the plane of the disc, as shown. Then,
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Physics-
A conducting ring of mass 2kg and radius 0.5m is placed on a smooth horizontal plane. The ring carries a current i=4A. A horizontal magnetic field B=10T is switched on at time t=0 as shown in figure. The initial angular acceleration of the ring will be
A conducting ring of mass 2kg and radius 0.5m is placed on a smooth horizontal plane. The ring carries a current i=4A. A horizontal magnetic field B=10T is switched on at time t=0 as shown in figure. The initial angular acceleration of the ring will be
Physics-General
Physics-
Calculate the magnetic moment of a thin wire with a current I=0.8A, wound tightly on half a tore. The diameter of the cross-section of the tore is equal to d=5.0cm, the number of turns is N=500.
Calculate the magnetic moment of a thin wire with a current I=0.8A, wound tightly on half a tore. The diameter of the cross-section of the tore is equal to d=5.0cm, the number of turns is N=500.
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Physics-
A straight current carrying conductor is placed in such a way that the current in the conductor flows in the direction out of the plane of the paper. The conductor is placed between two poles of two magnets, as shown. The conductor will experience a force in the direction towards
A straight current carrying conductor is placed in such a way that the current in the conductor flows in the direction out of the plane of the paper. The conductor is placed between two poles of two magnets, as shown. The conductor will experience a force in the direction towards
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Physics-
A long horizontal wire AB which is free to move in vertical plane and carries a steady current 20A, is in equilibrium at a height of 0.1 meter above another parallel long wire CD, which is fixed in horizontal plane and carries current 30A, as shown in the figure. Find the time period of oscillations when AB is slightly depressed 
A long horizontal wire AB which is free to move in vertical plane and carries a steady current 20A, is in equilibrium at a height of 0.1 meter above another parallel long wire CD, which is fixed in horizontal plane and carries current 30A, as shown in the figure. Find the time period of oscillations when AB is slightly depressed
Physics-General
Physics-
Figure shows a rod PQ of length 20.0cm and mass 200g suspended through a fixed point O by two threads of lengths 20.0cm each. A magnetic field of strength 0.500T exists in the vicinity of the wire PQ as shown in the figure. The wires connecting PQ with the battery are loose and exert no force on PQ. A current of 2.0A is established when the switch S is closed. Find the tension in the threads now.
Figure shows a rod PQ of length 20.0cm and mass 200g suspended through a fixed point O by two threads of lengths 20.0cm each. A magnetic field of strength 0.500T exists in the vicinity of the wire PQ as shown in the figure. The wires connecting PQ with the battery are loose and exert no force on PQ. A current of 2.0A is established when the switch S is closed. Find the tension in the threads now.
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Physics-
A particle of charge Q and mass M moves in a circular path of radius R in a uniform magnetic field of magnitude B. The same particle now moves with the same speed in a circular path of same radius R in the space between the cylindrical electrodes of the cylindrical capacitor. The radius of the inner electrode is R/2 while that of the outer electrode is 3R/2. Then the potential difference between the capacitor electrodes must be
A particle of charge Q and mass M moves in a circular path of radius R in a uniform magnetic field of magnitude B. The same particle now moves with the same speed in a circular path of same radius R in the space between the cylindrical electrodes of the cylindrical capacitor. The radius of the inner electrode is R/2 while that of the outer electrode is 3R/2. Then the potential difference between the capacitor electrodes must be
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A particle of specific charge (q/m) is projected from the origin of coordinates with initial velocity [ui - vj] Uniform electric magnetic fields exist in the region along the +y direction, of magnitude E and B. The particle will definitely return to the origin once if
A particle of specific charge (q/m) is projected from the origin of coordinates with initial velocity [ui - vj] Uniform electric magnetic fields exist in the region along the +y direction, of magnitude E and B. The particle will definitely return to the origin once if
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Physics-
A particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having width 
at angle 53° to the boundary of magnetic field. Find the angle q in the diagram.
A particle moving with velocity v having specific charge (q/m) enters a region of magnetic field B having width at angle 53° to the boundary of magnetic field. Find the angle q in the diagram.
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